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Molecular and functional characterizations of the association and interactions between nucleophosmin-anaplastic

Bin Shi1, Deeksha Vishwamitra, J Gabrielle Granda

  • 1Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

Neoplasia (New York, N.Y.)
|June 5, 2013
PubMed

Insights

Dual mutation of Nucleophosmin-anaplastic lymphoma kinase (NPM-ALK) at Tyr(644) and Tyr(664) abrogates its association with insulin-like growth factor receptor (IGF-IR). This dual mutation significantly diminishes NPM-ALK

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Aberrant expression of Nucleophosmin-anaplastic lymphoma kinase (NPM-ALK) drives T cell lymphoma in young individuals.
  • NPM-ALK exhibits potent oncogenic activity, but its precise mechanisms remain unclear.
  • NPM-ALK physically associates with type I insulin-like growth factor receptor (IGF-IR), forming a positive feedback loop.

Purpose of the Study:

  • To investigate if dual mutation of NPM-ALK at Tyr(644) and Tyr(664) abrogates its association with IGF-IR.
  • To assess the impact of this dual mutation on NPM-ALK's oncogenic potential.

Main Methods:

  • Site-directed mutagenesis to create NPM-ALK(Y644,664F) mutant.
  • Assessment of NPM-ALK and IGF-IR association.
  • Evaluation of cellular transformation, proliferation, migration, and anchorage-independent colony formation assays.

Main Results:

  • NPM-ALK(Y644,664F) completely lacks association with IGF-IR.
  • The dual mutation significantly diminishes NPM-ALK's oncogenic effects, including colony formation, cellular transformation, proliferation, and migration.
  • The Tyr(644)/Tyr(664) residues are crucial for NPM-ALK protein stability and its interaction with IGF-IR.

Conclusions:

  • The association between NPM-ALK and IGF-IR, mediated by Tyr(644) and Tyr(664), is critical for NPM-ALK's oncogenic activity in T cell lymphoma.
  • Targeting this NPM-ALK/IGF-IR interaction may offer a therapeutic strategy for aggressive lymphomas.

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